Dee Carter & Denis Hughes 
Purple Islands [EPUB ebook] 

To leave the earth in a vessel designed to ride the emptiness of outer space would certainly demand of its crew the very highest qualities of courage and determination. But if the journey was to be a one-way trip with the objective of establishing an offshoot of humanity on a distant world, then every mortal quality would have to be considerably strengthened. Such was the project launched by Doctor Helenus Smith. He selected his crew with apparently small regard for the obvious essentials, his motivations for doing so kept close to his chest. The trouble began when a nameless world interposed itself on their course, appearing from nowhere, and upon which they were unexpectedly forced to land . . .