Reviewit's now too many years since i read these, really, for yr hmbl srppnt. to review them - or the first five of them - but the young me was still in the process of attempting to read almost everything in three children's libraries that fell into ''sf'', ''historical fiction'', ''fantasy'', ''biggles books'', ’'history'', ''world war one & two pilots' biographies & autobiographies'' - plus trying aught else as happened to catch my eye and looked interesting; so yr hmbl srppnt. was still in the middle of learning what ''well written'' was, and only beginning to learn that some authors' books just were all too poorly written, to be worth starting another book by them.
so i don't remember these as being particularly poorly-written, and do remember some of the parts of the stories - mostly plot elements - with at least a little fondness; but i cannot judge them fairly, nor recommend them - nor give a ''warn off!''; but a ten-to-twelve year-old ppint. read the first five - almost all that'd been published at the time - and enjoyed them.
they start off with a space ''race'' to reach the only very occasionally near-earth small planet whose previous near approches have coincided suspiciously often with unusually-extended periods of peace and the flowering of civilisations on earth, and (on the part of the british-based western team, at least) to discover whether there is life upon the wandering planet°, and whether it truly has been influencing us to concentrate upon constructive activities, rather than upon warfare. the rival mission, however, based in one of the countries of the eastern bloc, has less sporting an approach to the race - and seeks to sabotage the uk-us effort...
° - yes, this is technically a redundancy, at least by linguistic derivation
#1: ''the lost planet'' (1953), (this novel)
#2: ''return to the lost planet'' (1954), q.v.
#3: ''secret of the lost planet'' (1955), q.v.
#4: ''red fire on the lost planet'' (1959), q.v.
#5: ''peril on the lost planet'' (1960), q.v.
decreasingly little to do with the lost planet:
#6: ''space agent from the lost planet'' (1961), q.v.
#7: ''space agent and the isles of fire'' (1962), q.v.
#8: ''space agent and the ancient peril'' (1964), q.v.